FL or ML any will do. fantasy or semi fantasy plotline where FL has a soulmate. and everyone wants and expects her to end up with the soulmate yet she ends up with someone else. something like that.
only one that i know : 

Witch's Love

Moon Lovers Scarlet Heart Ryeo
More than Blue: The series
Some Day or One Day (this is a little bit more tricky, since the characters are very complex in more than one way. I'd spoiler too much if i went into it but its definitely a must see drama)

 Ichika Kaneki:
fantasy or semi fantasy plotline where FL has a soulmate. and everyone wants and expects her to end up with the soulmate yet she ends up with someone else. something like that.

 Ichika Kaneki:
FL or ML any will do.

Not exactly a soulmate situation, but there is a person who is basically assigned to be the FL's fiance by powers outside of the FL's control and at a certain point everyone expects the FL to marry that person.

  • Love Between Fairy and Devil - Shuiyuntian and the Moon Tribe have been at war for centuries. The Xilan tribe remained neutral and focused on eliminating a greater evil (the dark spirit Tai Sui) but the tribe mysteriously disappeared. Before their disappearance, the Xilan tribe and Shuiyuntian had an ancient peace pact involving arranged marriages. The FL does not know it, but she is Xi Yun, the reincarnation of the Goddess of Xishan and the last survivor of the neutral Xilan tribe. She also does not know that she is engaged to Shuiyuntian's God of War (the SML). The marriage contract must be completed in order to unlock each of their true powers. While the FL's identity remains hidden, everyone thinks she is not good enough for the God of War. But a mirror that displays the future shows the ML and SFL images of the FL and SML's wedding, and after the FL's identity is revealed, everyone expects her to marry and end up with the SML. But ultimately the FL ends up with and marries the ML.
  • Extraordinary You

Other

  • A Little Red Flower - ML. A Chinese movie. The minor sci-fi / fantasy element doesn't really become apparent until the end.